不定式语态、时态变化：
主动 被动
一般 to do to be done
完成 to have done to have been done
进行 to be doing
不定式短语的句法
1。作主语：To make a plane first is a good idea.先作出计划是个好主意。
作主语时常用it做形式主语,如：It's dangerous to drive very fast.
2。作宾语：I want to try out some of my idea.我想试验我的一些想法。
3。作宾补：（1）带to:The villagers did not allow them to do this.村民们不许他们这样做。
（2）不带to:They talked until they heard her uncle return home.他们一直谈到听见她叔叔回来。
4。作状语：（1）作目的状语：He worked hard to build a house.
(2)作结果状语：What have I done to make you so angry?我干了什么使你这么生气
（3）作原因状语：She seemed surprised to meet us.
5.作定语（1）主谓关系：I was the last to go to bed.
(2)动宾关系：He has got lots of question to ask.
6.作同位语：The visit is a good chance to learn English.
7.作表语：His job was to design new machines.
8.作主补：Why is potato thought to be a very useful plant?为什么马铃薯被认为是一种非常有用的植物？
不带to：
（1）在情态助动词后:Can you come and play football?
(2)在had better,can't but,do nothing but,would rather/sooner之后:You'd better go to bed earlier tonight.
(3)在某些感官动词（如see,watch,hear,feel,notice)之后的复合宾语中：I saw him go into the room.
(4)在某些使役动词后（如make,let,have)的复合宾语中：I would have him wait for me.
(5)当两个或两个以上的不定式连用时，后面的不定式往往省略to:She taught him to read and (to) write.
（6）某些动词（如help,know)后的复合宾语中，可带也可省:She helped her mother (to) prepare for Christmas.
呼~~~终于完成了，建议你买本语法书！
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